Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2ae54498af681d…

MALICIOUS

PDF

38.5 KB Created: 2020-09-01 04:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da4c42aa92cf3241a91b70c30b9842c2 SHA-1: ba50f73f8a78ff277fbe2efb52aca1455b7ec94a SHA-256: 8b2ae54498af681dd9b9aa11032b522cc14cb02f9fd91ef26f961a924d492d46
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a link farm and a specific URL that is flagged as a malicious redirector. The document body, though heavily corrupted, appears to be a lure for an 'Antipolo weather report'. The presence of multiple external links and a malicious redirector suggests an attempt to drive traffic to malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=antipolo+weather+report
    • https://static.usrfiles.com/ugd/2f3ac6_528178155bbf4b49bfa6fd26463e944b.pdf
    • https://static.usrfiles.com/ugd/96768c_3f24881d124e40e18e44c86575ac1b47.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f231ca35e694daebc2b269ffb1be25c.pdf
    • https://static.usrfiles.com/ugd/a474dd_01c9d375f71a4dde9b6177e15b14c7c1.pdf
    • https://static.usrfiles.com/ugd/8b2c09_7be04254913d49cba59ce3e12df0e9d6.pdf
    • https://static.usrfiles.com/ugd/aa14a9_ff469b1a836740dcb290f22c953ba6e8.pdf
    • https://static.usrfiles.com/ugd/93c935_10efc269c82f498894abb67927e36c29.pdf
    • https://static.usrfiles.com/ugd/271e65_4d2bfe4ce1d84e279b00695a52f24294.pdf
    • https://static.usrfiles.com/ugd/d94ae5_bed495e99c65457cb3e5fae30c36eaa9.pdf
    • https://static.usrfiles.com/ugd/e2f197_e9b2e1bfcb434a999494b8754a87c0ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_fad2644dde6c416dadeb2f417ec578bd.pdf
    • https://static.usrfiles.com/ugd/8c0e65_2d3f776b62e3411c968171b0f5c2de0a.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d31.bin
e433b913799cc56b92ac2ea0ad431b72582d5af5ac447a80bb7d5aa453b819be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D31 4340 bytes
font_01_sfnt_off00005c68.bin
e904a962bc41cd36ba509a4a386eccf7c974395575ccd62e577c13e0041cea86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C68 4812 bytes
font_02_sfnt_off00006ccc.bin
550d4d686c022a514ef93183114a5659a112b0d9e657da715f6ae250a78aac91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCC 9492 bytes

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